ValhallaGH
Explorer
Change this to Charisma bonus since that's what you meant. A character with a Charisma score (and I don't know of anything playable without one) always has a charisma modifier, but not always a positive one.The slayer may add his charisma modifier, if any, to all his saving throws.
An 18th level character shouldn't be able to overcome DR / Epic without some kind of artifact. I'd add a note that he can bypass all non-epic DR and that at 21st level he can start bypassing epic DR. Also, you'll need to make clear that the class can't bypass DR / -, or that this class explicitly can if that's the intention.With a successful concentration check, DC 25, the slayer may focus a weapon to overcome all damage reduction.
I like the Resolve stuff a lot. Very flavorful, original-feeling and powerful.
Initially, it seemed a little bit on the weak side. The more I've looked at it, the more I think it's actually just right. You'll want to playtest it a few times, and it may need a couple bonus feats or a couple more skill points, but I think you've gotten the power balanced correctly.